No IANA assignment at all — 8877 sits inside the unassigned 8874–8879 block.
IANA lists the 8874–8879 range as Unassigned, so nothing has a claim on 8877 and no standard protocol answers there. Ports in the 88xx band get picked freely by individual products for alternate HTTP, admin, and diagnostic endpoints, which means the only reliable identification is local: find the process that owns the socket. Do not infer a service from the number.
Expose with care
An unassigned port is not a safe port; whatever chose it is often an admin or diagnostics endpoint that assumed nobody would reach it.
$ sudo lsof -nP -iTCP:8877 -sTCP:LISTENSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.